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v4l2: Add support of dmabuf
v4l has add a new IOCTL to export a buffer by using dmabuf. This patch allow to use this new IOTCL if it has been defined in videodev2.h I introduce a new IO mode (GST_V4L2_IO_DMABUF) to enable this way of working. https://bugzilla.gnome.org/show_bug.cgi?id=693826
This commit is contained in:
Benjamin Gaignard
Sebastian Dröge
parent
5b19be933b
commit
e29ab42922
6 changed files with 72 additions and 18 deletions
18
configure.ac
18
configure.ac
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@ -582,6 +582,24 @@ if test x$HAVE_GST_V4L2 = xyes; then
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fi
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fi
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# Check if v4l2 support dmabuf
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if test x$HAVE_GST_V4L2 = xyes; then
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AC_CHECK_DECLS(V4L2_MEMORY_DMABUF,,,[
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#include <sys/types.h>
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#ifdef __sun /* Solaris */
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#include <sys/types.h>
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#include <sys/videodev2.h>
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#elif __FreeBSD__
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#include <linux/videodev2.h>
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#else /* Linux */
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#include <linux/types.h>
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#define _LINUX_TIME_H
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#define __user
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#include <linux/videodev2.h>
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#endif
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])
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fi
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dnl Check for X11
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translit(dnm, m, l) AM_CONDITIONAL(USE_X, true)
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AG_GST_CHECK_FEATURE(X, [X libraries and plugins],
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@ -8,7 +8,6 @@ xv_source =
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xv_libs =
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endif
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# variables used for enum/marshal generation
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glib_enum_headers = tuner.h tunernorm.h tunerchannel.h
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glib_enum_define = GST_INTERFACES
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@ -56,11 +55,10 @@ libgstvideo4linux2_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) \
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libgstvideo4linux2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstvideo4linux2_la_LIBTOOLFLAGS = --tag=disable-static
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libgstvideo4linux2_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) \
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$(GST_BASE_LIBS) \
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$(GST_PLUGINS_BASE_LIBS) \
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-lgstallocators-$(GST_API_VERSION) \
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-lgstvideo-$(GST_API_VERSION) \
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$(GST_BASE_LIBS) \
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$(GST_LIBS) \
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$(xv_libs) \
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$(LIBV4L2_LIBS) \
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@ -29,10 +29,14 @@
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#include <sys/mman.h>
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#include <string.h>
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#include <unistd.h>
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#if HAVE_DECL_V4L2_MEMORY_DMABUF
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#include <fcntl.h>
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#endif
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#include "gst/video/video.h"
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#include "gst/video/gstvideometa.h"
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#include "gst/video/gstvideopool.h"
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#include "gst/allocators/gstdmabuf.h"
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#include <gstv4l2bufferpool.h>
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@ -104,6 +108,7 @@ gst_v4l2_buffer_pool_free_buffer (GstBufferPool * bpool, GstBuffer * buffer)
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switch (obj->mode) {
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case GST_V4L2_IO_RW:
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case GST_V4L2_IO_DMABUF:
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break;
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case GST_V4L2_IO_MMAP:
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{
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@ -152,6 +157,7 @@ gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
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break;
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}
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case GST_V4L2_IO_MMAP:
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case GST_V4L2_IO_DMABUF:
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{
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newbuf = gst_buffer_new ();
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meta = GST_V4L2_META_ADD (newbuf);
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@ -175,19 +181,35 @@ gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
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GST_LOG_OBJECT (pool, " memory: %d", meta->vbuffer.memory);
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if (meta->vbuffer.memory == V4L2_MEMORY_MMAP)
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GST_LOG_OBJECT (pool, " MMAP offset: %u", meta->vbuffer.m.offset);
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GST_LOG_OBJECT (pool, " length: %u", meta->vbuffer.length);
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meta->mem = v4l2_mmap (0, meta->vbuffer.length,
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PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
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meta->vbuffer.m.offset);
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if (meta->mem == MAP_FAILED)
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goto mmap_failed;
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if (obj->mode == GST_V4L2_IO_MMAP) {
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meta->mem = v4l2_mmap (0, meta->vbuffer.length,
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PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
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meta->vbuffer.m.offset);
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if (meta->mem == MAP_FAILED)
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goto mmap_failed;
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gst_buffer_append_memory (newbuf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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meta->mem, meta->vbuffer.length, 0, meta->vbuffer.length, NULL,
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NULL));
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gst_buffer_append_memory (newbuf,
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gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
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meta->mem, meta->vbuffer.length, 0, meta->vbuffer.length, NULL,
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NULL));
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}
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#if HAVE_DECL_V4L2_MEMORY_DMABUF
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if (obj->mode == GST_V4L2_IO_DMABUF) {
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struct v4l2_exportbuffer expbuf;
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expbuf.type = meta->vbuffer.type;
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expbuf.index = meta->vbuffer.index;
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expbuf.flags = O_CLOEXEC;
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if (v4l2_ioctl (pool->video_fd, VIDIOC_EXPBUF, &expbuf) < 0)
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goto mmap_failed;
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meta->vbuffer.memory = V4L2_MEMORY_DMABUF;
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gst_buffer_append_memory (newbuf,
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gst_dmabuf_allocator_alloc (pool->allocator, expbuf.fd,
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meta->vbuffer.length));
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}
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#endif
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/* add metadata to raw video buffers */
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if (pool->add_videometa && info->finfo) {
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const GstVideoFormatInfo *finfo = info->finfo;
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@ -298,6 +320,7 @@ gst_v4l2_buffer_pool_set_config (GstBufferPool * bpool, GstStructure * config)
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num_buffers = 1;
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copy_threshold = 0;
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break;
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case GST_V4L2_IO_DMABUF:
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case GST_V4L2_IO_MMAP:
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{
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/* request a reasonable number of buffers when no max specified. We will
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@ -357,6 +380,10 @@ gst_v4l2_buffer_pool_set_config (GstBufferPool * bpool, GstStructure * config)
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pool->size = size;
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pool->num_buffers = num_buffers;
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pool->copy_threshold = copy_threshold;
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if (obj->mode == GST_V4L2_IO_DMABUF)
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allocator = gst_dmabuf_allocator_obtain ();
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if (pool->allocator)
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gst_object_unref (pool->allocator);
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if ((pool->allocator = allocator))
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@ -406,6 +433,7 @@ start_streaming (GstV4l2BufferPool * pool)
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break;
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case GST_V4L2_IO_MMAP:
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case GST_V4L2_IO_USERPTR:
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case GST_V4L2_IO_DMABUF:
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GST_DEBUG_OBJECT (pool, "STREAMON");
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if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
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goto start_failed;
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@ -478,6 +506,7 @@ gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
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break;
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case GST_V4L2_IO_MMAP:
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case GST_V4L2_IO_USERPTR:
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case GST_V4L2_IO_DMABUF:
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/* we actually need to sync on all queued buffers but not
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* on the non-queued ones */
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GST_DEBUG_OBJECT (pool, "STREAMOFF");
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@ -614,7 +643,12 @@ gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer)
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memset (&vbuffer, 0x00, sizeof (vbuffer));
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vbuffer.type = obj->type;
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vbuffer.memory = V4L2_MEMORY_MMAP;
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#if HAVE_DECL_V4L2_MEMORY_DMABUF
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if (obj->mode == GST_V4L2_IO_DMABUF)
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vbuffer.memory = V4L2_MEMORY_DMABUF;
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else
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#endif
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vbuffer.memory = V4L2_MEMORY_MMAP;
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GST_LOG_OBJECT (pool, "doing DQBUF");
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if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &vbuffer) < 0)
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@ -743,7 +777,7 @@ gst_v4l2_buffer_pool_acquire_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
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ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
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buffer, params);
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break;
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case GST_V4L2_IO_DMABUF:
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case GST_V4L2_IO_MMAP:
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/* just dequeue a buffer, we basically use the queue of v4l2 as the
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* storage for our buffers. This function does poll first so we can
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@ -831,6 +865,7 @@ gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
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GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool, buffer);
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break;
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case GST_V4L2_IO_DMABUF:
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case GST_V4L2_IO_MMAP:
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/* queue back in the device */
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gst_v4l2_buffer_pool_qbuf (pool, buffer);
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@ -1083,7 +1118,7 @@ gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer * buf)
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/* FIXME, do write() */
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GST_WARNING_OBJECT (pool, "implement write()");
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break;
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case GST_V4L2_IO_DMABUF:
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case GST_V4L2_IO_MMAP:
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{
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GstBuffer *to_queue;
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@ -389,6 +389,7 @@ gst_v4l2_io_mode_get_type (void)
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{GST_V4L2_IO_RW, "GST_V4L2_IO_RW", "rw"},
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{GST_V4L2_IO_MMAP, "GST_V4L2_IO_MMAP", "mmap"},
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{GST_V4L2_IO_USERPTR, "GST_V4L2_IO_USERPTR", "userptr"},
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{GST_V4L2_IO_DMABUF, "GST_V4L2_IO_DMABUF", "dmabuf"},
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{0, NULL, NULL}
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};
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@ -75,7 +75,8 @@ typedef enum {
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GST_V4L2_IO_AUTO = 0,
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GST_V4L2_IO_RW = 1,
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GST_V4L2_IO_MMAP = 2,
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GST_V4L2_IO_USERPTR = 3
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GST_V4L2_IO_USERPTR = 3,
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GST_V4L2_IO_DMABUF = 4
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} GstV4l2IOMode;
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typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, gint * input);
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@ -571,6 +571,7 @@ gst_v4l2src_decide_allocation (GstBaseSrc * bsrc, GstQuery * query)
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break;
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case GST_V4L2_IO_MMAP:
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case GST_V4L2_IO_USERPTR:
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case GST_V4L2_IO_DMABUF:
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/* in streaming mode, prefer our own pool */
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pool = GST_BUFFER_POOL_CAST (obj->pool);
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size = obj->sizeimage;
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